Ccd Drive <Ir7105/7095; Ccd Drive <Ir7086 - Canon imageRUNNER 7095 Service Manual

Chapter 5
2. Digital Image Processing
- shading correction
CCD/AP
PCB
5.3.6.3 CCD Drive <iR7105/7095>
1. CCD
The CCD used in the machine is a 1-line linear image sensor.
- Number of pixels: 7400
- Size of a pixel: 4.7 x 4.7 ym
2. CCD Drive
The signals converted by the light-receiving block are sent out in 2 analog video signal channels (even-
numbered pixels, odd-numbered pixels).
Output
unit C
Light-
receiving
Output
unit D
5.3.6.4 CCD Drive <iR7086>
1. CCD
The CCD used in the machine is a 1-line linear image sensor.
- Number of pixels: 7450
- Size of a pixel: 4.7 x 4.7 ym
2. CCD Drive
The signals converted by the light-receiving block are sent out in 2 analog video signal channels (even-
numbered pixels, odd-numbered pixels).
Shift register
Light-receiving block
(photo diode)
Shift register
5-22
J101 J204
Gain correction
data
J205
J102
Digital image
signal
10
Direction of charge transfer
Clock pulse C
Transfer unit C
7400 7399 7398 7397 3704 3703
unit
Clock pulse D
Transfer unit D
Direction of charge transfer
Gate
6 5 4
Reader controller PCB
Target
CPU
value
Shading correction
F-5-48
Direction of charge transfer
Transfer unit A
3702 3701 3700 3699 3698 3697
Transfer unit B
Direction of charge transfer
F-5-49
Output buffer
Odd-numbered pixel data
3 2 1
Gate
Even-numbered pixel data
Output buffer
F-5-50
EEP-ROM
SRAM
J203
Digital image
signal
8
Clock pulse A
Output
unit A
CCD
shift
4 3 2 1
pulse
Output
unit B
Clock pulse B
0011-2249
0011-2256